<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入评论的内容（最多输入20字）" maxlength='120' v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户：匿名用户{{item.user_name}}&nbsp;&nbsp;发表时间：{{item.add_time | dataFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content === 'undefined' ? '此用户很懒，什么也没说':item.content}}
                </div>
            </div>
        </div>
        <div class="cmt-list">
            <div class="cmt-item">
                <div class="cmt-title">
                    第1楼&nbsp;&nbsp;用户：匿名用户&nbsp;&nbsp;发表时间：2020-07-19 12:57:12
                </div>
                <div class="cmt-body">
                    李白乘舟将欲行，忽闻岸上踏歌声
                </div>
            </div>
        </div>
        <div class="cmt-list">
            <div class="cmt-item">
                <div class="cmt-title">
                    第1楼&nbsp;&nbsp;用户：匿名用户&nbsp;&nbsp;发表时间：2020-07-19 12:57:12
                </div>
                <div class="cmt-body">
                    李白乘舟将欲行，忽闻岸上踏歌声
                </div>
            </div>
        </div>
        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>
<script>
import {Toast} from 'mint-ui';
export default {
    data(){
        return {
            pageIndex:1,//默认展示第一页的数据
            comments:[],//评论的数据
            msg:'',//评论数据为空
        }
    },
    created(){
        this.getComments()
    },
    methods:{
        //获取评论
        getComments(){
            this.$http.get('api/getcomments/'+this.id+'?pageindex=1'+this.pageIndex).then(result=>{
                if(result.body.status === 0){
                    // this.comments=result.body.message;
                    //获取新评论数据，老数据不清空。
                    this.comments=this.comments.concat(result.body.message)
                }else {
                    Toast('获取评论失败')
                }
            });
        },
        // 点击更多
        getMore(){
            this.pageIndex++;
            this.getComments();
        },
        //发表评论
        postComment(){
            //评论内容是否为空
            if(this.msg.trim().length === 0){
                return Toast('评论内容不能为空');
            }
            this.$http.post('api/postcomment/'+this.$router.params.id,{
                content:this.msg.trim()
                })
                .then(function(result){
                if(result.body.status === 0){
                    //拼接出评论
                    var cmt = {user_name:'匿名用户',
                    add_time : Data.now(),
                    content : this.msg.trim()
                    };
                    this.comments.unshift(cmt);
                    this.msg="";
                }
            });
        },
    },
    props:['id']
};
</script>
<style scoped lang="scss">
.cmt-container {
    h3 {
        font-size: 18px;
    }
    textarea {
        font-size: 14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list {
        margin: 15px 0;
        .cmt-item {
            font-size: 13px;
            .cmt-title {
                line-height: 30px;
                background-color: #cccccc;
            }
            .cmt-body {
                line-height: 35px;
                text-indent: 2em;
             }
        }
        
    }
}
</style>